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lib/crypto: sha512: Add support for SHA-384 and SHA-512
Add basic support for SHA-384 and SHA-512 to lib/crypto/. Various in-kernel users will be able to use this instead of the old-school crypto API, which is harder to use and has more overhead. The basic support added by this commit consists of the API and its documentation, backed by a C implementation of the algorithms. sha512_block_generic() is derived from crypto/sha512_generic.c. Acked-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250630160320.2888-3-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers
@@ -129,4 +129,132 @@ static inline void sha224_init(struct sha256_state *sctx)
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/* Simply use sha256_update as it is equivalent to sha224_update. */
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void sha224_final(struct sha256_state *sctx, u8 out[SHA224_DIGEST_SIZE]);
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/* State for the SHA-512 (and SHA-384) compression function */
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struct sha512_block_state {
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u64 h[8];
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};
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/*
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* Context structure, shared by SHA-384 and SHA-512. The sha384_ctx and
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* sha512_ctx structs wrap this one so that the API has proper typing and
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* doesn't allow mixing the SHA-384 and SHA-512 functions arbitrarily.
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*/
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struct __sha512_ctx {
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struct sha512_block_state state;
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u64 bytecount_lo;
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u64 bytecount_hi;
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u8 buf[SHA512_BLOCK_SIZE] __aligned(__alignof__(__be64));
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};
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void __sha512_update(struct __sha512_ctx *ctx, const u8 *data, size_t len);
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/**
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* struct sha384_ctx - Context for hashing a message with SHA-384
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* @ctx: private
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*/
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struct sha384_ctx {
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struct __sha512_ctx ctx;
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};
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/**
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* sha384_init() - Initialize a SHA-384 context for a new message
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* @ctx: the context to initialize
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*
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* If you don't need incremental computation, consider sha384() instead.
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*
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* Context: Any context.
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*/
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void sha384_init(struct sha384_ctx *ctx);
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/**
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* sha384_update() - Update a SHA-384 context with message data
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* @ctx: the context to update; must have been initialized
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* @data: the message data
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* @len: the data length in bytes
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*
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* This can be called any number of times.
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*
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* Context: Any context.
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*/
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static inline void sha384_update(struct sha384_ctx *ctx,
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const u8 *data, size_t len)
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{
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__sha512_update(&ctx->ctx, data, len);
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}
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/**
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* sha384_final() - Finish computing a SHA-384 message digest
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* @ctx: the context to finalize; must have been initialized
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* @out: (output) the resulting SHA-384 message digest
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*
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* After finishing, this zeroizes @ctx. So the caller does not need to do it.
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*
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* Context: Any context.
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*/
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void sha384_final(struct sha384_ctx *ctx, u8 out[SHA384_DIGEST_SIZE]);
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/**
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* sha384() - Compute SHA-384 message digest in one shot
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* @data: the message data
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* @len: the data length in bytes
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* @out: (output) the resulting SHA-384 message digest
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*
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* Context: Any context.
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*/
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void sha384(const u8 *data, size_t len, u8 out[SHA384_DIGEST_SIZE]);
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/**
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* struct sha512_ctx - Context for hashing a message with SHA-512
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* @ctx: private
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*/
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struct sha512_ctx {
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struct __sha512_ctx ctx;
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};
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/**
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* sha512_init() - Initialize a SHA-512 context for a new message
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* @ctx: the context to initialize
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*
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* If you don't need incremental computation, consider sha512() instead.
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*
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* Context: Any context.
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*/
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void sha512_init(struct sha512_ctx *ctx);
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/**
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* sha512_update() - Update a SHA-512 context with message data
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* @ctx: the context to update; must have been initialized
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* @data: the message data
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* @len: the data length in bytes
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*
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* This can be called any number of times.
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*
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* Context: Any context.
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*/
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static inline void sha512_update(struct sha512_ctx *ctx,
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const u8 *data, size_t len)
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{
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__sha512_update(&ctx->ctx, data, len);
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}
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/**
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* sha512_final() - Finish computing a SHA-512 message digest
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* @ctx: the context to finalize; must have been initialized
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* @out: (output) the resulting SHA-512 message digest
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*
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* After finishing, this zeroizes @ctx. So the caller does not need to do it.
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*
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* Context: Any context.
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*/
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void sha512_final(struct sha512_ctx *ctx, u8 out[SHA512_DIGEST_SIZE]);
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/**
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* sha512() - Compute SHA-512 message digest in one shot
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* @data: the message data
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* @len: the data length in bytes
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* @out: (output) the resulting SHA-512 message digest
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*
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* Context: Any context.
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*/
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void sha512(const u8 *data, size_t len, u8 out[SHA512_DIGEST_SIZE]);
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#endif /* _CRYPTO_SHA2_H */
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@@ -167,6 +167,16 @@ config CRYPTO_LIB_SHA256_GENERIC
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for SIMD implementations. If no arch specific implementation is
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enabled, this implementation serves the users of CRYPTO_LIB_SHA256.
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config CRYPTO_LIB_SHA512
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tristate
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help
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The SHA-384 and SHA-512 library functions. Select this if your module
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uses any of these functions from <crypto/sha2.h>.
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config CRYPTO_LIB_SHA512_ARCH
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bool
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depends on CRYPTO_LIB_SHA512 && !UML
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config CRYPTO_LIB_SM3
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tristate
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@@ -64,6 +64,12 @@ libsha256-y := sha256.o
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obj-$(CONFIG_CRYPTO_LIB_SHA256_GENERIC) += libsha256-generic.o
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libsha256-generic-y := sha256-generic.o
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obj-$(CONFIG_CRYPTO_LIB_SHA512) += libsha512.o
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libsha512-y := sha512.o
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ifeq ($(CONFIG_CRYPTO_LIB_SHA512_ARCH),y)
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CFLAGS_sha512.o += -I$(src)/$(SRCARCH)
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endif # CONFIG_CRYPTO_LIB_SHA512_ARCH
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obj-$(CONFIG_MPILIB) += mpi/
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obj-$(CONFIG_CRYPTO_SELFTESTS_FULL) += simd.o
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265
lib/crypto/sha512.c
Normal file
265
lib/crypto/sha512.c
Normal file
@@ -0,0 +1,265 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* SHA-384 and SHA-512 library functions
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*
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* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
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* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
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* Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
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* Copyright 2025 Google LLC
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*/
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#include <crypto/sha2.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/overflow.h>
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#include <linux/string.h>
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#include <linux/unaligned.h>
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static const struct sha512_block_state sha384_iv = {
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.h = {
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SHA384_H0, SHA384_H1, SHA384_H2, SHA384_H3,
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SHA384_H4, SHA384_H5, SHA384_H6, SHA384_H7,
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},
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};
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static const struct sha512_block_state sha512_iv = {
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.h = {
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SHA512_H0, SHA512_H1, SHA512_H2, SHA512_H3,
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SHA512_H4, SHA512_H5, SHA512_H6, SHA512_H7,
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},
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};
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static const u64 sha512_K[80] = {
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0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
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0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
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0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
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0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
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0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
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0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
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0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
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0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
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0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
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0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
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0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
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0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
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0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
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0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
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0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
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0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
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0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
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0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
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0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
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0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
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0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
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0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
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0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
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0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
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0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
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0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
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0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
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};
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#define Ch(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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#define Maj(x, y, z) (((x) & (y)) | ((z) & ((x) | (y))))
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#define e0(x) (ror64((x), 28) ^ ror64((x), 34) ^ ror64((x), 39))
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#define e1(x) (ror64((x), 14) ^ ror64((x), 18) ^ ror64((x), 41))
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#define s0(x) (ror64((x), 1) ^ ror64((x), 8) ^ ((x) >> 7))
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#define s1(x) (ror64((x), 19) ^ ror64((x), 61) ^ ((x) >> 6))
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static void sha512_block_generic(struct sha512_block_state *state,
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const u8 *data)
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{
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u64 a = state->h[0];
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u64 b = state->h[1];
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u64 c = state->h[2];
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u64 d = state->h[3];
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u64 e = state->h[4];
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u64 f = state->h[5];
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u64 g = state->h[6];
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u64 h = state->h[7];
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u64 t1, t2;
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u64 W[16];
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for (int j = 0; j < 16; j++)
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W[j] = get_unaligned_be64(data + j * sizeof(u64));
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for (int i = 0; i < 80; i += 8) {
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if ((i & 15) == 0 && i != 0) {
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for (int j = 0; j < 16; j++) {
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W[j & 15] += s1(W[(j - 2) & 15]) +
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W[(j - 7) & 15] +
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s0(W[(j - 15) & 15]);
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}
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}
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t1 = h + e1(e) + Ch(e, f, g) + sha512_K[i] + W[(i & 15)];
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t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2;
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t1 = g + e1(d) + Ch(d, e, f) + sha512_K[i+1] + W[(i & 15) + 1];
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t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2;
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t1 = f + e1(c) + Ch(c, d, e) + sha512_K[i+2] + W[(i & 15) + 2];
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t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2;
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t1 = e + e1(b) + Ch(b, c, d) + sha512_K[i+3] + W[(i & 15) + 3];
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t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2;
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t1 = d + e1(a) + Ch(a, b, c) + sha512_K[i+4] + W[(i & 15) + 4];
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t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2;
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t1 = c + e1(h) + Ch(h, a, b) + sha512_K[i+5] + W[(i & 15) + 5];
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t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2;
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t1 = b + e1(g) + Ch(g, h, a) + sha512_K[i+6] + W[(i & 15) + 6];
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t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2;
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t1 = a + e1(f) + Ch(f, g, h) + sha512_K[i+7] + W[(i & 15) + 7];
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t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2;
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}
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state->h[0] += a;
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state->h[1] += b;
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state->h[2] += c;
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state->h[3] += d;
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state->h[4] += e;
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state->h[5] += f;
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state->h[6] += g;
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state->h[7] += h;
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}
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static void __maybe_unused
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sha512_blocks_generic(struct sha512_block_state *state,
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const u8 *data, size_t nblocks)
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{
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do {
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sha512_block_generic(state, data);
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data += SHA512_BLOCK_SIZE;
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} while (--nblocks);
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}
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#ifdef CONFIG_CRYPTO_LIB_SHA512_ARCH
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#include "sha512.h" /* $(SRCARCH)/sha512.h */
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#else
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#define sha512_blocks sha512_blocks_generic
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#endif
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static void __sha512_init(struct __sha512_ctx *ctx,
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const struct sha512_block_state *iv,
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u64 initial_bytecount)
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{
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ctx->state = *iv;
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ctx->bytecount_lo = initial_bytecount;
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ctx->bytecount_hi = 0;
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}
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void sha384_init(struct sha384_ctx *ctx)
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{
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__sha512_init(&ctx->ctx, &sha384_iv, 0);
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}
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EXPORT_SYMBOL_GPL(sha384_init);
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void sha512_init(struct sha512_ctx *ctx)
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{
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__sha512_init(&ctx->ctx, &sha512_iv, 0);
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}
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EXPORT_SYMBOL_GPL(sha512_init);
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void __sha512_update(struct __sha512_ctx *ctx, const u8 *data, size_t len)
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{
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size_t partial = ctx->bytecount_lo % SHA512_BLOCK_SIZE;
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if (check_add_overflow(ctx->bytecount_lo, len, &ctx->bytecount_lo))
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ctx->bytecount_hi++;
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if (partial + len >= SHA512_BLOCK_SIZE) {
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size_t nblocks;
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if (partial) {
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size_t l = SHA512_BLOCK_SIZE - partial;
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memcpy(&ctx->buf[partial], data, l);
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data += l;
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len -= l;
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sha512_blocks(&ctx->state, ctx->buf, 1);
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}
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nblocks = len / SHA512_BLOCK_SIZE;
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len %= SHA512_BLOCK_SIZE;
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if (nblocks) {
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sha512_blocks(&ctx->state, data, nblocks);
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data += nblocks * SHA512_BLOCK_SIZE;
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}
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partial = 0;
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}
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if (len)
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memcpy(&ctx->buf[partial], data, len);
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}
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EXPORT_SYMBOL_GPL(__sha512_update);
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static void __sha512_final(struct __sha512_ctx *ctx,
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u8 *out, size_t digest_size)
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{
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u64 bitcount_hi = (ctx->bytecount_hi << 3) | (ctx->bytecount_lo >> 61);
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u64 bitcount_lo = ctx->bytecount_lo << 3;
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size_t partial = ctx->bytecount_lo % SHA512_BLOCK_SIZE;
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ctx->buf[partial++] = 0x80;
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if (partial > SHA512_BLOCK_SIZE - 16) {
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memset(&ctx->buf[partial], 0, SHA512_BLOCK_SIZE - partial);
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sha512_blocks(&ctx->state, ctx->buf, 1);
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partial = 0;
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}
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memset(&ctx->buf[partial], 0, SHA512_BLOCK_SIZE - 16 - partial);
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*(__be64 *)&ctx->buf[SHA512_BLOCK_SIZE - 16] = cpu_to_be64(bitcount_hi);
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*(__be64 *)&ctx->buf[SHA512_BLOCK_SIZE - 8] = cpu_to_be64(bitcount_lo);
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sha512_blocks(&ctx->state, ctx->buf, 1);
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for (size_t i = 0; i < digest_size; i += 8)
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put_unaligned_be64(ctx->state.h[i / 8], out + i);
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}
|
||||
|
||||
void sha384_final(struct sha384_ctx *ctx, u8 out[SHA384_DIGEST_SIZE])
|
||||
{
|
||||
__sha512_final(&ctx->ctx, out, SHA384_DIGEST_SIZE);
|
||||
memzero_explicit(ctx, sizeof(*ctx));
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(sha384_final);
|
||||
|
||||
void sha512_final(struct sha512_ctx *ctx, u8 out[SHA512_DIGEST_SIZE])
|
||||
{
|
||||
__sha512_final(&ctx->ctx, out, SHA512_DIGEST_SIZE);
|
||||
memzero_explicit(ctx, sizeof(*ctx));
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(sha512_final);
|
||||
|
||||
void sha384(const u8 *data, size_t len, u8 out[SHA384_DIGEST_SIZE])
|
||||
{
|
||||
struct sha384_ctx ctx;
|
||||
|
||||
sha384_init(&ctx);
|
||||
sha384_update(&ctx, data, len);
|
||||
sha384_final(&ctx, out);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(sha384);
|
||||
|
||||
void sha512(const u8 *data, size_t len, u8 out[SHA512_DIGEST_SIZE])
|
||||
{
|
||||
struct sha512_ctx ctx;
|
||||
|
||||
sha512_init(&ctx);
|
||||
sha512_update(&ctx, data, len);
|
||||
sha512_final(&ctx, out);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(sha512);
|
||||
|
||||
#ifdef sha512_mod_init_arch
|
||||
static int __init sha512_mod_init(void)
|
||||
{
|
||||
sha512_mod_init_arch();
|
||||
return 0;
|
||||
}
|
||||
subsys_initcall(sha512_mod_init);
|
||||
|
||||
static void __exit sha512_mod_exit(void)
|
||||
{
|
||||
}
|
||||
module_exit(sha512_mod_exit);
|
||||
#endif
|
||||
|
||||
MODULE_DESCRIPTION("SHA-384 and SHA-512 library functions");
|
||||
MODULE_LICENSE("GPL");
|
||||
Reference in New Issue
Block a user